Rockwell Automation 1756-L6x_L7x ControlLogix System User Manual - Manual (Page 71)

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 71
Start Using the Controller Chapter 3
Save the Program to On-board NVS Memory
Follow these steps to save the program to NVS memory when the controller loses
power.
1. Remove power from the controller.
You can remove power in one of two ways:
•
Turn power off to the chassis while the controller is installed in the
chassis.
• Remove the controller from a powered chassis.
Immediately after the controller is no longer powered, the program starts
saving while the OK status indicator is green (this green is a dimmer green
than normal operation), then turns red after program save is complete.
Once the ESM stops operating, it turns off.
The following graphic shows the OK status indicator on the controller.
2. Leave the ESM on the controller until the OK status indicator is Off.
Clear the Program from On-board NVS Memory
If your application lets you, follow these steps to clear the program from the on-
board NVS memory of the 1756-L7x controller.
1. Remove the ESM from the controller.
2. Remove power from the controller.
You can remove power in one of the following two ways:
•
Turn power off to the chassis while the controller is installed in the
chassis.
• Remove the controller from a powered chassis.
3. Reinstall the ESM into the controller.
4. Restore power to the controller in one of these two ways:
•
If the controller is installed in the chassis, turn power back onto the
chassis.
• If the controller is not installed into the chassis, reinstall the controller
into the chassis and turn power back onto the chassis.